What are the ethics of using animals in art? Reflecting on Dark Mofo's 150th action by Hermann Nitsch

After a week of outrage and debate around a Dark Mofo artwork by Hermann Nitsch using a bull carcass and 500 litres of blood Ryk Goddard gathers cool heads to examine the artistic, moral and legal issues. So before you chuck a steak on the barbie and deplore or delight in the proposed artwork, here's some views from art critic Jane Rankin-Reid, artist, scholar and animal art specialist Yvette Watt and lawyer Robert Meredith.